In terms of priority, the Desert and Island Obelisks should be built first.
The resources can take some time to collect, but it makes for a fun late-game challenge. In the late game, players will be raking it in hand over fist, especially if they follow advanced tips for in-game moneymaking. Considering their high cost in both materials and in-game money, some players may wonder if these teleportation towers are worth the high price.